eventmanager.js

来自「php绿色服务器,让大家试用greenamp」· JavaScript 代码 · 共 662 行 · 第 1/2 页

/*
 * Ext JS Library 1.0.1
 * Copyright(c) 2006-2007, Ext JS, LLC.
 * [e-mail]
 * 
 * http://www.extjs.com/license
 */

/**
 * @class Ext.EventManager
 * Registers event handlers that want to receive a normalized EventObject instead of the standard browser event and provides 
 * several useful events directly.
 * See {@link Ext.EventObject} for more details on normalized event objects.
 * @singleton
 */
Ext.EventManager = function(){
    var docReadyEvent, docReadyProcId, docReadyState = false;
    var resizeEvent, resizeTask, textEvent, textSize;
    var E = Ext.lib.Event;
    var D = Ext.lib.Dom;


    var fireDocReady = function(){
        if(!docReadyState){
            docReadyState = true;
            Ext.isReady = true;
            if(docReadyProcId){
                clearInterval(docReadyProcId);
            }
            if(Ext.isGecko || Ext.isOpera) {
                document.removeEventListener("DOMContentLoaded", fireDocReady, false);
            }
            if(docReadyEvent){
                docReadyEvent.fire();
                docReadyEvent.clearListeners();
            }
        }
    };
    
    var initDocReady = function(){
        docReadyEvent = new Ext.util.Event();
        if(Ext.isGecko || Ext.isOpera) {
            document.addEventListener("DOMContentLoaded", fireDocReady, false);
        }else if(Ext.isIE){
            // inspired by  http://www.thefutureoftheweb.com/blog/2006/6/adddomloadevent
            document.write("<s"+'cript id="ie-deferred-loader" defer="defer" src="/'+'/:"></s'+"cript>");
            var defer = document.getElementById("ie-deferred-loader");
            defer.onreadystatechange = function(){
                if(this.readyState == "complete"){
                    fireDocReady();
                    defer.onreadystatechange = null;
                    defer.parentNode.removeChild(defer);
                }
            };
        }else if(Ext.isSafari){ 
            docReadyProcId = setInterval(function(){
                var rs = document.readyState;
                if(rs == "complete") {
                    fireDocReady();     
                 }
            }, 10);
        }
        // no matter what, make sure it fires on load
        E.on(window, "load", fireDocReady);
    };

    var createBuffered = function(h, o){
        var task = new Ext.util.DelayedTask(h);
        return function(e){
            // create new event object impl so new events don't wipe out properties
            e = new Ext.EventObjectImpl(e);
            task.delay(o.buffer, h, null, [e]);
        };
    };

    var createSingle = function(h, el, ename, fn){
        return function(e){
            Ext.EventManager.removeListener(el, ename, fn);
            h(e);
        };
    };

    var createDelayed = function(h, o){
        return function(e){
            // create new event object impl so new events don't wipe out properties
            e = new Ext.EventObjectImpl(e);
            setTimeout(function(){
                h(e);
            }, o.delay || 10);
        };
    };

    var listen = function(element, ename, opt, fn, scope){
        var o = (!opt || typeof opt == "boolean") ? {} : opt;
        fn = fn || o.fn; scope = scope || o.scope;
        var el = Ext.getDom(element);
        if(!el){
            throw "Error listening for \"" + ename + '\". Element "' + element + '" doesn\'t exist.';
        }
        var h = function(e){
            e = Ext.EventObject.setEvent(e);
            var t;
            if(o.delegate){
                t = e.getTarget(o.delegate, el);
                if(!t){
                    return;
                }
            }else{
                t = e.target;
            }
            if(o.stopEvent === true){
                e.stopEvent();
            }
            if(o.preventDefault === true){
               e.preventDefault();
            }
            if(o.stopPropagation === true){
                e.stopPropagation();
            }

            if(o.normalized === false){
                e = e.browserEvent;
            }

            fn.call(scope || el, e, t, o);
        };
        if(o.delay){
            h = createDelayed(h, o);
        }
        if(o.single){
            h = createSingle(h, el, ename, fn);
        }
        if(o.buffer){
            h = createBuffered(h, o);
        }
        fn._handlers = fn._handlers || [];
        fn._handlers.push([Ext.id(el), ename, h]);

        E.on(el, ename, h);
        if(ename == "mousewheel" && el.addEventListener){ // workaround for jQuery
            el.addEventListener("DOMMouseScroll", h, false);
            E.on(window, 'unload', function(){
                el.removeEventListener("DOMMouseScroll", h, false);
            });
        }
        if(ename == "mousedown" && el == document){ // fix stopped mousedowns on the document
            Ext.EventManager.stoppedMouseDownEvent.addListener(h);
        }
        return h;
    };

    var stopListening = function(el, ename, fn){
        var id = Ext.id(el), hds = fn._handlers, hd = fn;
        if(hds){
            for(var i = 0, len = hds.length; i < len; i++){
                var h = hds[i];
                if(h[0] == id && h[1] == ename){
                    hd = h[2];
                    hds.splice(i, 1);
                    break;
                }
            }
        }
        E.un(el, ename, hd);
        el = Ext.getDom(el);
        if(ename == "mousewheel" && el.addEventListener){
            el.removeEventListener("DOMMouseScroll", hd, false);
        }
        if(ename == "mousedown" && el == document){ // fix stopped mousedowns on the document
            Ext.EventManager.stoppedMouseDownEvent.removeListener(hd);
        }
    };

    var propRe = /^(?:scope|delay|buffer|single|stopEvent|preventDefault|stopPropagation|normalized)$/;
    var pub = {
        
        /** 
         * This is no longer needed and is deprecated. Places a simple wrapper around an event handler to override the browser event
         * object with a Ext.EventObject
         * @param {Function} fn        The method the event invokes
         * @param {Object}   scope    An object that becomes the scope of the handler
         * @param {boolean}  override If true, the obj passed in becomes
         *                             the execution scope of the listener
         * @return {Function} The wrapped function
         * @deprecated
         */
        wrap : function(fn, scope, override){
            return function(e){
                Ext.EventObject.setEvent(e);
                fn.call(override ? scope || window : window, Ext.EventObject, scope);
            };
        },
        
        /**
         * Appends an event handler
         *
         * @param {String/HTMLElement}   element        The html element or id to assign the 
         *                             event to
         * @param {String}   eventName     The type of event to append
         * @param {Function} fn        The method the event invokes
         * @param {Object}   options   An object with standard EventManager options
         */
        addListener : function(element, eventName, fn, scope, options){
            if(typeof eventName == "object"){
                var o = eventName;
                for(var e in o){
                    if(propRe.test(e)){
                        continue;
                    }
                    if(typeof o[e] == "function"){
                        // shared options
                        listen(element, e, o, o[e], o.scope);
                    }else{
                        // individual options
                        listen(element, e, o[e]);
                    }
                }
                return;
            }
            return listen(element, eventName, options, fn, scope);
        },
        
        /**
         * Removes an event handler
         *
         * @param {String/HTMLElement}   element        The id or html element to remove the 
         *                             event from
         * @param {String}   eventName     The type of event
         * @param {Function} fn
         * @return {Boolean} True if a listener was actually removed
         */
        removeListener : function(element, eventName, fn){
            return stopListening(element, eventName, fn);
        },
        
        /**
         * Fires when the document is ready (before onload and before images are loaded). Can be 
         * accessed shorthanded Ext.onReady().
         * @param {Function} fn        The method the event invokes
         * @param {Object}   scope    An  object that becomes the scope of the handler
         * @param {boolean}  options
         */
        onDocumentReady : function(fn, scope, options){
            if(docReadyState){ // if it already fired
                fn.call(scope || window, scope);
                return;
            }
            if(!docReadyEvent){
                initDocReady();
            }
            docReadyEvent.addListener(fn, scope, options);
        },
        
        /**
         * Fires when the window is resized and provides resize event buffering (50 milliseconds), passes new viewport width and height to handlers.
         * @param {Function} fn        The method the event invokes
         * @param {Object}   scope    An object that becomes the scope of the handler
         * @param {boolean}  options
         */
        onWindowResize : function(fn, scope, options){
            if(!resizeEvent){
                resizeEvent = new Ext.util.Event();
                resizeTask = new Ext.util.DelayedTask(function(){
                    resizeEvent.fire(D.getViewWidth(), D.getViewHeight());
                });
                E.on(window, "resize", function(){
                    if(Ext.isIE){
                        resizeTask.delay(50);
                    }else{
                        resizeEvent.fire(D.getViewWidth(), D.getViewHeight());
                    }
                });
            }
            resizeEvent.addListener(fn, scope, options);
        },

        /**
         * Fires when the user changes the active text size. Handler gets called with 2 params, the old size and the new size.
         * @param {Function} fn        The method the event invokes
         * @param {Object}   scope    An object that becomes the scope of the handler
         * @param {boolean}  options
         */
        onTextResize : function(fn, scope, options){
            if(!textEvent){
                textEvent = new Ext.util.Event();
                var textEl = new Ext.Element(document.createElement('div'));
                textEl.dom.className = 'x-text-resize';
                textEl.dom.innerHTML = 'X';
                textEl.appendTo(document.body);
                textSize = textEl.dom.offsetHeight;
                setInterval(function(){
                    if(textEl.dom.offsetHeight != textSize){
                        textEvent.fire(textSize, textSize = textEl.dom.offsetHeight);
                    }
                }, this.textResizeInterval);
            }
            textEvent.addListener(fn, scope, options);
        },

        /**
         * Removes the passed window resize listener.
         * @param {Function} fn        The method the event invokes
         * @param {Object}   scope    The scope of handler
         */
        removeResizeListener : function(fn, scope){
            if(resizeEvent){
                resizeEvent.removeListener(fn, scope);
            }
        },
        
        fireResize : function(){
            if(resizeEvent){
                resizeEvent.fire(D.getViewWidth(), D.getViewHeight());
            }   
        },
        /**
         * Url used for onDocumentReady with using SSL (defaults to Ext.SSL_SECURE_URL)
         */
        ieDeferSrc : false,
        textResizeInterval : 50
    };
    /**
     * Appends an event handler (shorthand for addListener)
     *
     * @param {String/HTMLElement}   element        The html element or id to assign the 
     *                             event to
     * @param {String}   eventName     The type of event to append
     * @param {Function} fn        The method the event invokes
     * @param {Object}   scope    An arbitrary object that will be 
     *                             passed as a parameter to the handler
     * @param {boolean}  override If true, the obj passed in becomes